Car-heater



(No Model.)

W. G. DUNN.

GAR HEATER. No. 365,977. Patented July 5, 1887.

Uairrn draws lpa'ren'r rides,

WARD G, DUNN, OF CHICAGO, ILLINOIS.

CAR-HEATER.

SPECIFICATION forming part of Letters Patent No. 365,977, dated July 5, 1887,

Application filed April 5, 1886. Serial No. 197,640.11 No model.)

T 0 aZZ whom,v it may concern.-

Be it known that I, WARD O. DUNN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Car-Heaters, of which the following is a specification.

It is the object of my invention to provide an economical, convenient, and readily-controlled heater for railwaycars. For these purposes, undoubtedly, the most convenient and compact fuel is oil; but in the use of oilburncrs it has heretofore been difficult to provide a readily-controlled and practically-effieient motor for forcing the oil out from its reservoir into the burner of the stove. I propose to solve the problem by utilizing for this purpose the air-pressure of the ordinary brake system as used on railway-trains; and my invention consists, chiefly, in combining a stove or heater of this kind with the reservoir of an air-pressure-brake system, inserting between them a cheek-valve, so as to maintain at all times the requisite amount of pressure in the cylinder of the heater, notwithstanding whatever variations may occur in the pressure of the brake system.

My invention consists, further, in certain details of construction,hereinafter fully shown and described, and pointed out in the claim.

In the drawings annexed hereto and forming part of this specification, Figure 1 represents my apparatus as a whole. Fig. 2 shows the check-valve in the pipe between the two cylinders in cross-section.

A represents the floor of the car, to which is attached the box 13, containing the fire-p0t O and combustionchamher D of an oil-heater of the general description of that shown in my application for Letters Patent dated October 23, 1885, Serial No. 180,741. About the fire-pot is a hot-air chamber, E, surrounded with a filling, F, of asbcstus or equivalent material suitable for retaining the heat within the chamber. From the combustion chamber D a dischargepipe, G, passes up into the car and around the bottom thereof, near the floor and under the seats, connecting with the outer air through a vertical branch, II. Sur

charge of hot air into the ear.

rounding this discha1'ge pipe is a hot-air box, I, in communication, as shown, with the hotair chamber E. This box follows the dischargepipe G around the car, and at intervals in it are placed registers K, for the dis- This location of parts'has the advantage of utilizing all the heat produced by the heater.

Connected with the burner L, by supplypipe M, is the oil-reservoir N, from which the oil is forced into the burner by air-pressure from the reservoir of the brake system 0, the communication being through the pipe P. As is well known, the pressure in the brake pipes and reservoir is constantly varying as the brakes are thrown on or off between the,

extreme limits of, say, ten and sixty pounds.

In order to maintain a proper combustion in the heater, it is desirable that the pressure in the oil-reservoir should not fall below forty pounds. To keep the pressure at or above that point, Iinsert in the pipe 1? between the two reservoirs an ordinary check-valve, It, which will of course close whenever the pressure in reservoir 0 falls below that in reservoir N, bridging over the occasional drops in the pressure of the brake system, which are, it is true, only temporary, but which would, nevertheless, if permitted to act on the oil reservoir, most seriously interfere with the op eration of the heater.

The connection with the air-rescrvoir may of course be made from any of the pipes of the brake system as well as from the cylinder or reservoir. I

It will be observed. that, as regards the working of my invention, it is immaterial with what fluid the brake system is operated. If water were used, or some other gas than air, my invention couldbe used with it equally well, although it might in such a case be nee essary to introduce a sliding diaphragm in the cylinder N between the fluid and the oil, as shown in broken lines in Fig. 1.

I am aware-that it has been proposed to use a pressurevalve between an air-pump and the fuelreservoir of a lamp, in order to regulate the feed. I am also aware that it has been proposed to use the compressed air of a brake system to force out liquid, if desired, on openapparatus with the said fuel-reservoir, and a ing a stop-cock, for extinguishing fire. I do check-valve in said pipe, substantially as de- IO not claim these constructions. scribed, and for the purpose set forth I claim 7 v T 5 The combination of a car, a fluid-pressure WARD DUNI\' brake apparatus, an oil-burning heater pro- Witnesses: vided with a fuel-reservoir mounted on. said FREDERICK G. GOODW'IN,

car, a pipe connecting a cylinder of the brake E. L. HUBER. 

